How to prepare the ScanNet V2 data

[DYZhang09]

Hi, I'm interested in your great work and I'm trying to run the semantic segmentation experiment. But after preparing ScanNetV2 data following the instructions of PointGroup(https://github.com/dvlab-research/PointGroup) as your instructions say, I still cannot launch the training process. After the preprocessing, I get files like these

but the code seems to only support [scene_id].ply files. How to solve this problem? Any other preprocessing needed?